Which retail giant first introduced the revolutionary concept of the 'supermarket' format in 1930, allowing customers to self-serve from various departments under one roof?

Before the age of Amazon and Walmart, retail pioneers transformed how people shopped and created the foundations for today's commerce landscape. This trivia question explores a pivotal moment in retail history that changed consumer behavior forever. Test your knowledge about one of the most significant innovations in retail that we now take for granted but was revolutionary when first introduced.

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King Kullen (founded by Michael Cullen)
A&P (The Great Atlantic & Pacific Tea Company)
Piggly Wiggly (founded by Clarence Saunders)
Safeway (founded as Skaggs United Stores)